I ma rewriting everything to avoid opening yet another post.

Initial issue was the board not posting anymore after some modifications, partial recap, soldering some missing headers...
Issue was unusual: without a keyboard plugged the POST process would hang after the first 3 steps, codes dd-d0-14 (14 means keyboard test present/missing).
I think there is still some issue there as it should post and go on to an error message before boot attempt. ISSUE SOLVED for the time being

I'm going to make an image of the BIOS, as Intel's upgrade floppy disk has it split on 6 64kb files.

I found that the board comes with two USB 2.0 ports not connected to +5V, by design, missing a fuse and a couple of NPN or PNP.
I'll have to find what they are from other users as I can(t figure it out by pics.

Thanks

This board is the original Intel, I have one tailored for IBM (same everything except a connector present for its special front panel).
https://theretroweb.com/motherboards/s/intel- … mv2-maryville-2